Onishi, Masayoshi; Nagaoka, Nobutaka; Hiraki, Katsuma; Itoh, Kei published the article 《Syntheses, properties and crystal structures of several new bis(polypyrazolylborato)lanthanoid(III) complexes》. Keywords: crystal structure neodymium pyrazolylborate pyrazole aqua; lanthanide pyrazolylborate pyrazole quinolinolato aqua preparation; neodymium pyrazolylborate pyrazole quinolinolato aqua preparation; lutetium pyrazolylborate pyrazole quinolinolato aqua preparation; ytterbium pyrazolylborate pyrazole quinolinolato aqua preparation.They researched the compound: Potassiumtris(1-pyrazolyl)borohydride( cas:18583-60-3 ).Quality Control of Potassiumtris(1-pyrazolyl)borohydride. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:18583-60-3) here.
Lanthanoid(III) chlorides MCl3·6H2O (M = Lu, Nd, Yb) in THF were treated with K tris(1-pyrazolyl)hydroborate K(BHpz3) (pz = 1-pyrazolyl) in a (1/1) molar ratio at -78°, and [MCl(BHpz3)2(L)] (L = Hpz for M = Lu and Nd; L = H2O for M = Yb) were isolated. In the presence of N-methylpyrazole (N-CH3pz), similar reaction procedures gave [MCl(BHpz3)2(N-CH3pz)], of which further treatment with Na 8-quinolinolate Na(quin) afforded the stable complexes [M(BHpz3)2(quin)] quant. From single crystal x-ray structural analyses, distorted square-antiprismatic geometry was determined for [NdCl(BHpz3)2(L)] (L = Hpz and H2O). Compared with N-CH3pz adduct formation, Hpz coordination to Lu and Nd was fairly strong, owing to the H bonding formed between the Cl atom on Nd and the acidic 1-N proton in the coordinated Hpz.
As far as I know, this compound(18583-60-3)Quality Control of Potassiumtris(1-pyrazolyl)borohydride can be applied in many ways, which is helpful for the development of experiments. Therefore many people are doing relevant researches.
Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics